Avoid duplicate and very near points in Angle snapping draw mode 
(will reuse existing nodes in mappaint.node.snap-distance pixel radius if possible)
+DrawAction minor code cleanup


git-svn-id: http://josm.openstreetmap.de/svn/trunk@5922 0c6e7542-c601-0410-84e7-c038aed88b3b
Merge branch 'master' into mirror